Silicone rubber heater

silicone rubber heaterSilicone rubber heater from Sinomas makes it possible to achieve ennergy efficient and extremely flexible heating solutions. By flexible we mean two things. Firstly, you will get fully customized heaters where you can specify the input voltage, the power consumption, the dimension or even 3D geometry, the means of installation, the thermal insulation, temperature control method, etc. Heat will be transferred to the intended devices efficiently at your will. On the other hand, you can order as less as one heater for test. It costs you nothing more if you need to change the design later on.

Heating Element

Silicone rubber heater can be made with etched foil heating elements or wire wound heating elements.

Etched foil heating elementEtched foil silicone rubber heaters are made with thin metal foils (0.02mm), usually nickel based alloy, as the resistance element. The resistance pattern to be etched is designed in CAD and transferred to the foil, which is laminated to the insulation substrate. The element substrate is then processed through acid spray to produce the desired resistance pattern.

Wire wound elements for silicone rubber heaters are relatively old technology. They are wired manually according to certain patterns.  The productivity and wiring accuracy highly depend on the skill of the workers, especially for small sized heaters. Unless for irregular shaped 3D heating applications, wire wound technology has been phased out at Sinomas.

The etched foil silicone rubber heater has exceptional heat transfer compared to wire wound elements, due to its large flat surface area. It can deliver more uniform heat profiles with higher watt density, providing longer service time. It can also be zoned with distributed wattage or separate heating circuits to accommodate for load variations. Edge compensation for the temperature can also be achieved.

Dual Voltage, Zoning and Three Phase

Dual Voltage, three phase input for silicone heaterdual voltage silicone rubber heatersilicone heater for medical

Due to the flexibility in circuit design of silicone rubber heaters, multiple heating circuits can be designed to accommodate dual voltage supply (same watts output) and multiple zones. On dual voltage heaters, three leads, including a common in a different color, are provided for wiring the heater in series for the higher voltage and parallel for the lower voltage. 12/24/48Vdc and 120/240/480 Vac are most popular configurations. Multiple circuit areas can be zoned to achieve different heating effects. Three-phase circuits can also be designed for high current applications.

Waterproof Silicone Rubber heater

waterproof silicone heaterWe have developed leak tight silicone rubber heaters which can be immersed into water for long operation. This is very useful for high humidity environment or fluid heating where conventional immersion heaters can't be used due to space or mounting limit. The applicable fluid includes some corrosive chemical solution. For example, our silicone rubber heaters have been used for SCR (Selective Catalytic Reduction) tank Adblue heating for exhaust gas control of diesel vehicles. Please consult us for chemical compatibility if you have similar demand.

Specification of silicone rubber heaters

Electrical Characteristics Physical Characteristics
Voltage rating:   0-480V, AC or DC Max operation temperature:  250°C
Watt density:  ≤ 5.0W/cm2 Continuous operation temperature:  ≤200°C
Watt tolerance:  +/-5% Thermal control:  per requirement
Insulation resistance:  >500M Minimum size:  10mm x 25mm
Dielectric strength:  1500V/S Maximum size:  800mm x 3000mm
Ground mesh:  per requirement Termination:  Teflon cable, silicone cable, PI cable
Mean lifetime:  ≥100,000 hours Thermal insulation:  optional, silicone sponge of different thickness


Factory Vulcanization

silicone rubber heaterfactory vulcanization of silicone rubber heaterpipe fitting of silicone rubber heater

Factory vulcanization of the silicone rubber heater is recommended for the following permanent installations:

  • heater to be installed inside or outside of a drum (e.g. mug heater)
  • heater to be installed on complicated shaped objects, like bent or T pipes
  • applications which have high requirement on temperature distribution

With our special tools, the silicone rubber heaters will be preformed to a certain shape and easily attached to your equipment without extra work. Minimum temperature variation will be ensured.

We delivery standard heating pipe assembly (with power plug) as well. Please consult us for your application.

Temperature rise curve

This figure illustrates the surface temperature of a 1.5mm thick silicone rubber heater with different watt density over time. The heater is hanged vertically in 20°C free air. The data is supposed to be a reference for 1.5mm thick silicone rubber heater of standard structure. This is to give you an idea how fast the heating can be. In reality, among other parameters, attachment with different objects will result in different rise curve and stablized temperature. For example, the temperature rise of the drum heaters will be much slower.

temperature rise curve of silicone rubber heaters